OpenTelemetry stats collection and distributed tracing framework for Erlang.
Requires OTP 21.3 of above.
The OpenTelemetry specification defines a language library as having 2 components, the API and the SDK. The API must not only define the interfaces of any implementation in that language but also be able to function as a noop implementation of the tracer. The SDK is the default implementation of the API that must be optional.
If you are instrumenting a project your application should only depend on the OpenTelemetry API application.
This repository is the Erlang's SDK implementation and should be included in the final release and configured to setup the sampler, span processors and span exporters.
In an Erlang project add opentelemetry
as the first element of the release's applications:
{relx, [{release, {<name>, <version>},
[{opentelemetry, temporary},
<your applications>]},
...]}.
In the above example opentelemetry
is set to temporary
so that if the opentelemetry
application crashes, or is shutdown, it does not terminate the other applications in the project. This is optional, the opentelemetry
application purposely sticks to permanent
for the processes started by the root supervisor to leave it up to the end user whether they want the crash or shutdown or opentelemetry
to be ignored or cause the shutdown of the rest of the applications in the release.
Doing the same for an Elixir project would be:
def project do
[
...
releases: [
<name>: [
applications: [opentelemetry: :temporary]
],
...
]
]
end
Running benchmarks is done with benchee. Benchmark functions are in modules under samples/
. To run them open a rebar3 shell in the bench
profile:
$ rebar3 as bench compile
> ot_benchmarks:run().
If an Elixir script is wanted for the benchmarks they could be run like:
$ ERL_LIBS=_build/bench/lib/ mix run --no-mix-exs samples/run.exs
Start the interop web server in a shell:
$ rebar3 as interop shell
> w3c_trace_context_interop:run().
Then, clone the W3C Trace Context repo and run the tests:
$ cd test
$ python3 test.py http://127.0.0.1:5000/test